Really any half decent striker could do the same with the quality of assists coming from Chelsea's midfield.
Some of his goals, sure, but his movement has been great. He's occupying defenders, he scored the headed goal without jumping just holding the players away from him and making himself some space... though helped by the guy infront of him bear hugging I think it was Cahill.
His timing is brilliant, he can score from anywhere and he doesn't stop moving. I don't think most of his goals couldn't have been scored by others, but there will be goals to come this year that lesser strikers won't score.
It's not the 15 goals he'll get that say Giroud could also score, it will be the other 10 he'll get that Giroud wouldn't score that will make the difference. The best strikers will score the simple ones as well as the others. As yet he's scored 4 goals from 9 shots, 6 of which are on target. HIs stats will likely get worse over the season with more games but even the best strikers exceptionally rarely break a goals/shots ratio of 1:3.
Many brilliant strikers have missed the types of chances he's scored.
Brentford 3-1 up now against Brighton, certainly don't seem out matched after promotion, as it stands they'd be up to 5th on goal difference now. Depends on other results as well, others around them can pick up more points but it's still a strong start.
EDIT;- and Brighton make it 3-2